/*
 * Copyright 2002-2014 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.format;

import java.lang.annotation.Annotation;
import java.util.Set;

/**
 * A factory that creates formatters to format values of fields annotated with a particular
 * {@link Annotation}.
 *
 * <p>For example, a {@code DateTimeFormatAnnotationFormatterFactory} might create a formatter
 * that formats {@code Date} values set on fields annotated with {@code @DateTimeFormat}.
 *
 * @param <A> the annotation type that should trigger formatting
 * @author Keith Donald
 * @since 3.0
 */
public interface AnnotationFormatterFactory<A extends Annotation> {

    /**
     * The types of fields that may be annotated with the &lt;A&gt; annotation.
     */
    Set<Class<?>> getFieldTypes();

    /**
     * Get the Printer to print the value of a field of {@code fieldType} annotated with
     * {@code annotation}.
     * <p>If the type T the printer accepts is not assignable to {@code fieldType}, a
     * coercion from {@code fieldType} to T will be attempted before the Printer is invoked.
     *
     * @param annotation the annotation instance
     * @param fieldType  the type of field that was annotated
     * @return the printer
     */
    Printer<?> getPrinter(A annotation, Class<?> fieldType);

    /**
     * Get the Parser to parse a submitted value for a field of {@code fieldType}
     * annotated with {@code annotation}.
     * <p>If the object the parser returns is not assignable to {@code fieldType},
     * a coercion to {@code fieldType} will be attempted before the field is set.
     *
     * @param annotation the annotation instance
     * @param fieldType  the type of field that was annotated
     * @return the parser
     */
    Parser<?> getParser(A annotation, Class<?> fieldType);

}
